Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9de138d61e51777…

MALICIOUS

PDF

86.0 KB Created: 2020-11-06 18:54:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 5b5791e9e0c38291b1e880dee3aa69c3 SHA-1: 1d5d6285e915143048e384d01fca608b89cbc4f7 SHA-256: e9de138d61e517774f64233d208277eab9b806c3c1fa18b76be62483dc1349cd
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to obscure the ultimate destination. The 'SE_BRAND_CREDENTIAL_PHISH' heuristic confirms that the document impersonates the brand Chase and uses a redirector URL to facilitate credential phishing. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://lurukise.weebly.com/uploads/1/3/4/4/134454795/7084871.pdf.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://traffset.ru/aws?keyword=ravenclaw+head+of+house+hogwarts PDF link annotation
    • https://lurukise.weebly.com/uploads/1/3/4/4/134454795/7084871.pdfIn PDF document text
    • https://gavawujag.weebly.com/uploads/1/3/4/3/134370084/7622433.pdfIn PDF document text
    • https://pepisukuwen.weebly.com/uploads/1/3/1/6/131606293/vidalizifexa_domamoxelonefa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368237/normal_5f9e0b5ee2d45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379841/normal_5fa37321a37ee.pdfIn PDF document text
    • https://senabexe.weebly.com/uploads/1/3/4/2/134265557/zikevotudowivo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385634/normal_5f9378337e408.pdfIn PDF document text
    • https://jufaxexave.weebly.com/uploads/1/3/0/7/130775513/6082316.pdfIn PDF document text
    • https://laguvibokabab.weebly.com/uploads/1/3/4/3/134383318/zesos-tikejo-tagezalu.pdfIn PDF document text
    • https://zuragani.weebly.com/uploads/1/3/1/4/131438510/dimexazuziti.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/4918653.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jefobexapulow/sajufezagetizufonidopoz.pdfIn PDF document text
    • https://bomeviw.files.wordpress.com/2020/11/91798184258.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BD 5276 bytes
SHA-256: 05cff8e73caa8ede0f053af18cd411a3a4d39fe3fac62a4bb2a2e369c67c9e92
font_01_sfnt_off000117bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BF 10964 bytes
SHA-256: a73fbeee1d2660b6f5986286db8fbdf9b8e1d3e7154c35045f091a8116863834
font_02_sfnt_off00013cdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CDF 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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